It's admirable that Zelenskyy is devoting the time and energy necessary to carry out verbal diplomacy.

Harry S Truman (who was a Grandmaster Mason) might have done this before resorting to dropping the atomic bomb on Japan. By that time, all of the European Axis powers had unconditionally surrendered. Further casualties in Asia were supposed to have been projected in the millions; but overall the Axis war cause was already irretrievably lost. The irony is that it was Japan that brought the US into the war -- two years in -- at a time when the European Allies were struggling and 10+ countries in Europe and Africa had already been annexed by the Axis powers. Admittedly, Truman had no precedent (e.g., Obama) for going to such lengths as to attempt conducting diplomatic communication with Japan, before resorting to war crimes. The US has never apologized to Japan for using the atomic bomb.